If he was sold as an Ameraucana, he's a mixed breed bird. The problem with breeds like the Bielefelders is they're an easy look to mimic simply by crossing a barred bird and a red bird. But just as all black dogs aren't Labs, all black and red barred birds aren't Bielefelders.
I believe the coloring on a Bielefelder is cuckoo over a black breasted red, so a rooster should have a black breast. OPs bird is red breasted, so the base color is wrong.